More Optic 6 questions!

[andy_max]

Hey everyone,

We've been having quite a bit of trouble setting up our Hi-Tec Optic 6 tx with our electron reciever on a Twister 3d heli. Last night, we went to see someone about it, to see if he could help. He couldn't, and sent us this e-mail today; basically, it looks as though there's not a lot that can be done.

Does anyone disagree with this? E-mail is as follows.



I've been on to several club members about the twister. The main problem seen is the swash
plate direction. Make SURE there is the only the one type on the tx. for the transmitter mixing
functions are quite different for each type.


With the elevator in front the servo arm must fall to tilt the swash plate for forward pitch, while if
it's at the back it must rise. While the elevator servo can be reversed easily enough, when you
get to know the transmitter, for the collective function to work properly all three servos must
move in the same direction. In the fuss last night I failed to realise that. If you reverse the
elevator you would need to reverse the roll control servos too. This means the roll control itself
is now reversed! Roll right and the heli goes left! To correct this you would need to change the
receiver sockets over from channel one to channel two or vice versa. ( read below about
channel numbers on the rx) With a bit of luck this now should give proper pitch and roll
commands.

However, the swash plate now moves down with throttle/ collective input instead of up. While
the throttle is no problem as it's reversable electrically from the tx. the swash plate direction is
a mechanical problem and needs a mechanical fix. This MIGHT be possible if the rotor blade
holders are rotated 180 degrees so that the arm connecting the servo pushrod now lies on the
other side so increasing collective when the swash plate moves down instead of up. The main
problems here might be in the geometery of the head and the position of the pushrods so that
they don't foul anything.

Another small or maybe not so small problem is the channel numbers for pitch and roll on the
receiver itself. My Graupner tx is set up for roll on channel 1 while my Hitech tx gives pitch on
channel 1. You would need to find out if the Electron rx is a proper match for your tx regarding
channel numbers as it MIGHT affect the ccpm mixing function. IE the tx. thinks it's talking to
channel 1 while in fact it's trying to move channel 2.

All very difficult! If you decide to cut your losses you can salvage most of the equipment. The
tx. is fine. The rx. too will do other models as will the 4 servos and the gyro. The rotor blades
will fit other helis so if you do decide to sell only the bare airframe would need to go on Ebay.
Another club member is already waiting for your decision! The vultures are already overhead.



I realise it's a long e-mail, but we just find it hard to believe that this setup, which was recommended to us, doesn't actually work, and has little hope of working at all!

Thanks in advance,

andy.

[hawkman]

I wish I was there in person to be able to help.....I cant quite accept that this heli wont fly...
The Trex I helped set up is using a jr propo TX with the Align RX which is as supplied with the kit....one of these package deals.

Now....bear with me

There was a set of instructions for a 'patch' the futaba type gear just slotted into the channels that we would expect....but with jr propo gear the channels had to be reassigned.....so channel 1 became the ESC channel of all things!!! yeah....sure confused me....but I thought 'what the hell' and the heli flys ok....with no problems.

I quite honestly would get a compatable RX and TX if I were to get a Trex....I just dont like the 'patch' idea....but it works and the owner is happy enough.

Somebody here on this site must know the problem you have......as for the elevator reversing...hmmmmm

you would need to power the radio gear up.....and then look at the swash plate servo settings......where it says elevator there should be a figure....50%? maybe? there could well be a plus or a minus figure next to it......dial the figure so you get 50% (or whatever figure you have) but the value should change...so if you have a minus.....you should get a plus.....ie

50+....change to 50-.....this is only an example......the value will dictate the way the servo works.....DO NOT USE SERVO REVERSE......the aim is to get all servos working in unison for the collective.....but the functions like aileron and elevator might need to be reversed....thats where the plus or minus aspects come into play....the percentage value is for the actual travel rate of the swashplate.

Make sure to remove all servo horns when doing this at first.....dont stress the controls by using too much servo travel......

Try to get the servo arms as near as possible to perfection....use SUBTRIM to center the servo arms where needed.....then use your ATV settings to limit the servo arm travel....aim for equal values...say 100% one way...and 100% the other way.

Do post and let us know how you get on......where did you get this heli? it has no instructions at all?

Rob

[evolusia]

Hi Andy_Max.

The optic6 and electron rx will work OK although the electron is a bit heavy for this heli.

Set up is as follows and please note. The swashplate moves down to increase the collective pitch.

Reset your chosen memory and then select helicopter mode and the 120 degree swash option. Drop ch 1,2 and 6 ATV`s to 50% for the time being and connect your cyclic servos in the following order.


ch 1 - aileron (left servo looking from the rear)
ch 2 - elevator (front servo)
ch 6 - collective pitch (right servo)

Switch on Tx and move collective stick to the middle. Connect a 4.8v battery to rx ch 3. Be ready to disconnect if any servo gets stalled. You will need to physically reset the servo arms to neutral if this happens.

Next move the elevator stick and check that the elevator servo moves in the correct direction ie up for back stick. Correct with servo reverse function if necessary.

Same with aileron/pitch servos, Correct with servo reverse to get correct left/right swash movement.

Assuming rod lengths are all equal any tilt in the swashplate should be corrected with the sub trims only.

Now try the collective control. If servos do not move in the desired directions then go to swash mixing function to correct. Here values will all be set at 70%. Change the output of the channel in need of correction by changing its value to the opposite value. ie + 70 would become -70 and visa versa. Do this one channel at a time so you don`t get lost. Any channel inter-coupling should be removed with the ATV function only

Everything OK then open up ATV`s to 90% and set your pitch curves as normal.



Pitch curve?
Try
Norm -2,INH,4,INH,10 beginner
Norm -4,INH,3,INH,10 after some practice
Id-1 -6,INH,2,INH,9 basic aerobatics

Full blown 3D is -10,INH,0,INH,10 but you need a good tail servo and gyro to keep things together. Use about 25% expo until you get used to the flight characteristics.

Throttle curves?

Try the following to start with and fine tune to suit.

Norm 0,50,70,90,100
Id1 85,INH,75,INH,100
3D 100,INH,85,INH,100

From my experience I would also bin the original alloy mainshaft and replace it with the steel upgrade or make some from carbon rod. Stock up on tail drive pick off gears cos if you try to fly off grass without a board you are gonna need them. A few spare feathering spindles and servo gear sets to hand is also a good idea

Evolusia

My apologies if I have repeated anyone elses info.

[evolusia]

Hi again,this might help if you have no pics to go by.

http://www.jperkinsdistribution.co.uk/ and look in helicopters on the home page.

or

http://www.jperkinsdistribution.co.u...%20-%20Twister




Evolusia